President George W. Bush has personally authorized a secretive eavesdropping program in the United States more than three dozen times since October 2001, a senior intelligence official said Friday night. The disclosure follows angry demands by lawmakers earlier in the day for a congressional inquiry into whether the monitoring by the highly secretive National Security Agency violated civil liberties. "There is no doubt that this is inappropriate," declared Republican Sen. Arlen Specter of Pennsylvania, chairman of the Senate Judiciary Committee. He promised hearings early next year. In a broad defense of the program put forward hours later, a senior intelligence official told The Associated Press that the eavesdropping was narrowly designed to go after possible terrorist threats in the United States.